I have this code:
"use strict";
import browserSync from "browser-sync";
import httpProxy from "http-proxy";
let proxy = httpProxy.createProxyServer({});
and I have installed babel-core and babel-cli globally via npm. The point is when I try to compile with this on my terminal:
babel proxy.js --out-file proxified.js
The output file gets copied instead of compiled (I mean, it's the same as the source file).
What am I missing here?
Babel is a transformation framework. Pre-6.x, it enabled certain transformations by default, but with the increased usage of Node versions which natively support many ES6 features, it has become much more important that things be configurable. By default, Babel 6.x does not perform any transformations. You need to tell it what transformations to run:
npm install babel-preset-env
and run
babel --presets env proxy.js --out-file proxified.js
or create a .babelrc file containing
{
"presets": [
"env"
]
}
and run it just like you were before.
env in this case is a preset which basically says to compile all standard ES* behavior to ES5. If you are using Node versions that support some ES6, you may want to consider doing
{
"presets": [
["env", { "targets": { "node": "true" } }],
]
}
to tell the preset to only process things that are not supported by your Node version. You can also include browser versions in your targets if you need browser support.
Most of these answers are obsolete. #babel/preset-env and "#babel/preset-react are what you need (as of July 2019).
I had the same problem with a different cause:
The code I was trying to load was not under the package directory, and Babel does not default to transpiling outside the package directory.
I solved it by moving the imported code, but perhaps I could have also used some inclusion statement in the Babel configuration.
First ensure you have the following node modules:
npm i -D webpack babel-core babel-preset-es2015 babel-preset-stage-2 babel-loader
Next, add this to your Webpack config file (webpack.config.js) :
// webpack.config.js
...
module : {
loaders : [
{
test : /\.js$/,
loader : 'babel',
exclude : /node_modules/,
options : {
presets : [ 'es2015', 'stage-2' ] // stage-2 if required
}
}
]
}
...
References:
https://gist.github.com/Couto/6c6164c24ae031bff935
https://github.com/babel/babel-loader/issues/214
Good Luck!
As of 2020, Jan:
STEP 1: Install the Babel presets:
yarn add -D #babel/preset-env #babel/preset-react
STEP 2: Create a file: babelrc.js and add the presets:
module.exports = {
// ...
presets: ["#babel/preset-env", "#babel/preset-react"],
// ...
}
STEP 3:- Install the babel-loader:
yarn add -D babel-loader
STEP 4:- Add the loader config in your webpack.config.js:
{
//...
module: [
rules: [
test: /\.(js|mjs|jsx|ts|tsx)$/,
loader: require.resolve('babel-loader')
]
]
//...
}
Good Luck...
npm install --save-dev babel-preset-node5
npm install --save-dev babel-preset-react
...and then creating a .babelrc with the presets:
{
"presets": [
"node5",
"react"
]
}
...resolved a very similar issue for me, with babel 3.8.6, and node v5.10.1
https://www.npmjs.com/package/babel-preset-node5
https://www.npmjs.com/package/babel-preset-react
Same error, different cause:
Transpiling had worked before and then suddenly stopped working, with files simply being copied as is.
Turns out I opened the .babelrc at some point and Windows decided to append .txt to the filename. Now that .babelrc.txt wasn't recognized by babel. Removing the .txt suffix fixed that.
fix your .babelrc
{
"presets": [
"react",
"ES2015"
]
}
In year 2018:
Install following packages if you haven't yet:
npm install babel-loader babel-preset-react
webpack.config.js
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['es2015','react'] // <--- !`react` must be part of presets!
}
}
],
}
Ultimate solution
I wasted 3 days on this
import react from 'react' unexpected identifier
I tried modifying webpack.config.js and package.json files, and adding .babelrc, installing & updating packages via npm, I've visited many, many pages but nothing has worked.
What worked? Two words: npm start. That's right.
run the
npm start
command in the terminal to launch a local server
...
(mind that it might not work straight away but perhaps only after you do some work on npm because before trying this out I had deleted all the changes in those files and it worked, so after you're really done, treat it as your last resort)
I found that info on this neat page. It's in Polish but feel free to use Google translate on it.
Related
I'm running into an issue that appears to be due to my lack of understanding with webpack. I have created a file structure that looks like this:
|-serverless-cloud-functions
||-my-local-libs
|||-twilioClient
||-service1
||-service2
twilioClient is a library that I made, that needs to be included in service1 and service2. Because of limitations with the serverless framework, you can not bundle files outside of the service, so the only option (I think) is to use a npm install ../my-local-libs/twilioClient from inside a service folder. This works for installing the module, but now it resides in node_modules. Currently, I am using webpack and babel as well.
I believe my root issue is that my webpack config looks like this:
const slsw = require("serverless-webpack");
const nodeExternals = require("webpack-node-externals");
module.exports = {
entry: slsw.lib.entries,
target: "node",
externals: [nodeExternals()],
module: {
rules: [
{
test: /\.js$/,
loader: "babel-loader",
exclude: /node_modules/
}
]
}
};
Which excludes my es6 twilioClient lib, because it is in the node_modules folder.
I saw a couple people suggest that this was the way to accomplish 'exclude everything in node modules besides twilioClient':
module.exports = {
entry: slsw.lib.entries,
target: "node",
externals: [nodeExternals()],
module: {
rules: [
{
test: /\.js$/,
loader: "babel-loader",
exclude: /node_modules\/(?!(twilioClient))/
}
]
}
};
But this did not work in my case. Any help is greatly appreciated.
Instead of trying to exclude twilioClient, you could use Babel to compile it separately. Something like this (in the twilioClient directory):
npx babel src --out-dir lib
In twilioClient/package.json, you could then set main to lib/index.js instead of src/index.js so that importing scripts will get the compiled version:
"main": "lib/index.js",
Then instead of hosting twilioClient alongside service1 and service2, you could just push it to github, and install it in each client using npm:
npm install --save http://github.com/your_github_username/twilioclient.git
Now you can use twilioClient as if it were any other npm dependency.
I have encountered a similar problem of using local common package with babel.
If you would like to not change the main since you also actively edit the package and do not want to run the build each time you make a change, then you should use the below babel.config.js
module.exports = function(api) {
api.cache(true);
const plugins = [
'#babel/plugin-transform-modules-commonjs',
];
return {
plugins,
ignore: [
/node_modules\/(?!(your-pkg)\/)/,
],
};
};
This transpiles the code for your-pkg into node_modules dir in dist.
Description
I have a nodejs + TypeScript + express project and currently the source *.ts files are being bundled with webpack and node_modules is ignored with webpack-node-externals.
When I deploy bundle.js in Docker, I would need to still run npm i --production on the target image to install the dependencies, which installs all the modules listed in package.json
The Problem:
If I am using only one function from lodash which does not have native parts, the whole lodash module (4.8MB) is installed nonetheless (which is intended).
This results in a huge node_modules folder where functions inside packages aren't always necessarily used in bundle.js. This problem is especially prevalent when containerizing the application with Docker.
Is there any way to bundle non-native modules with Webpack while leaving native modules alone?
This is very similar to https://stackoverflow.com/a/54393299/2234013 - I believe you're looking for nodeExternals({ whitelist }) and babel-loader exclude:
// excerpt from https://stackoverflow.com/a/54393299/2234013
externals: [
nodeExternals({
whitelist: [/lodash/]
})
],
...
module: {
rules: [
{
...
exclude: /node_modules\/(?!(lodash).*/,
use: {
loader: 'babel-loader',
...
}
}
]
}
I have this npm module that I created and every time I try to include it to see if it works I get this error:
Unexpected token <
You may need an appropriate loader to handle this file type.
I've used react-starterkit and included it in main.js like so
var ReactDOM = require('react-dom');
var ColorPicker = require('color-picker-react');
ReactDOM.render(<ColorPicker />, document.getElementById('app'));
then when i run gulp which runs webpack I get the error. Here's the webpack.config.js
module.exports.getConfig = function(type) {
var isDev = type === 'development';
var config = {
entry: './app/scripts/main.js',
output: {
path: __dirname,
filename: 'main.js'
},
debug : isDev,
module: {
loaders: [{
test: /\.jsx?$/,
exclude: /node_modules/,
loader: 'babel',
query: {
presets: ['react', 'es2015']
}
}]
}
};
if(isDev){
config.devtool = 'eval';
}
return config;
}
I've tried everything I could think of and still can't get it to work. I'm not using ES6 anywhere and I've tried many different react starter kits but I just can't get it to work. Please help!!!
P.S. I am able to get the project to run when I clone it locally and build out app.js with browserify like so: browserify -t [ babelify --presets [ react ] ] app.js -o bundle.js
To solve the problem you need to remove the line exclude: /node_modules/ if you are not the author of the npm module (But you should go with another module).
The component color-picker-react doesn't seem to have a release build or script that compile the jsx. So you need to do it by your own and compile the jsx file on the fly using wepack.
Instead of just removing the exclude: /node_modules/
You can exclude all /node_modules/ except the /node_modules/color-picker-react folder by using a regex pattern :
//will exclude all modules except `color-picker-react`
exclude: /node_modules\/(?!color-picker-react).*\//,
EDIT Basics for creating a npm module:
A correct setup for a npm module is to add a prepublish script to
ensure compilation happens automatically before uploading to NPM.
Thus when you push your module to npm the users doesn't need to compile the module they can just require it.
Taking an example of a node_module:
https://github.com/securingsincity/react-ace/blob/master/package.json
The package.json file is saying which file is the entry point when you required the module
"main": "lib/ace.js",
You can see in the github repository that the lib folder doesn't exist because added to the .gitignore but the line
"prepublish": "npm run clean && npm run build"
is run before uploading to NPM so on the npm repository the lib/ folder exist and you can see it when you do npm install --save react-ace the lib folder appears in the node_modules/react-ace/ folder
A great link that explains how to build npm modules in es6 for example http://javascriptplayground.com/blog/2015/10/authoring-modules-in-es6/
EDIT explain what needs to be done on react-color-picker module :
Sorry i didn't see that you was the author of the module so you should go with the solution below.
The react-color-picker for example doesn't have a prepublish script and the main file is index.js which is
var ColorPicker = require('./colorpicker.js'); // require a file with jsx will throw an error if not precompiled
module.exports = ColorPicker;
So a syntax error is thrown.
To be able to use the npm module in your other applications :
Create a webpack config for the npm module to handle the conversion of your react component written using jsx (you can take some of the webpack configs of this module https://github.com/securingsincity/react-ace set libraryTarget: 'umd' you module will be more easy to consume from various module systems (global, AMD, CommonJS).)
add a prepublish script that output a precompiled version of the color picker (lib/pickedprecompiled.js)
change the main to "main": "lib/pickedprecompiled.js",
I have this code:
"use strict";
import browserSync from "browser-sync";
import httpProxy from "http-proxy";
let proxy = httpProxy.createProxyServer({});
and I have installed babel-core and babel-cli globally via npm. The point is when I try to compile with this on my terminal:
babel proxy.js --out-file proxified.js
The output file gets copied instead of compiled (I mean, it's the same as the source file).
What am I missing here?
Babel is a transformation framework. Pre-6.x, it enabled certain transformations by default, but with the increased usage of Node versions which natively support many ES6 features, it has become much more important that things be configurable. By default, Babel 6.x does not perform any transformations. You need to tell it what transformations to run:
npm install babel-preset-env
and run
babel --presets env proxy.js --out-file proxified.js
or create a .babelrc file containing
{
"presets": [
"env"
]
}
and run it just like you were before.
env in this case is a preset which basically says to compile all standard ES* behavior to ES5. If you are using Node versions that support some ES6, you may want to consider doing
{
"presets": [
["env", { "targets": { "node": "true" } }],
]
}
to tell the preset to only process things that are not supported by your Node version. You can also include browser versions in your targets if you need browser support.
Most of these answers are obsolete. #babel/preset-env and "#babel/preset-react are what you need (as of July 2019).
I had the same problem with a different cause:
The code I was trying to load was not under the package directory, and Babel does not default to transpiling outside the package directory.
I solved it by moving the imported code, but perhaps I could have also used some inclusion statement in the Babel configuration.
First ensure you have the following node modules:
npm i -D webpack babel-core babel-preset-es2015 babel-preset-stage-2 babel-loader
Next, add this to your Webpack config file (webpack.config.js) :
// webpack.config.js
...
module : {
loaders : [
{
test : /\.js$/,
loader : 'babel',
exclude : /node_modules/,
options : {
presets : [ 'es2015', 'stage-2' ] // stage-2 if required
}
}
]
}
...
References:
https://gist.github.com/Couto/6c6164c24ae031bff935
https://github.com/babel/babel-loader/issues/214
Good Luck!
As of 2020, Jan:
STEP 1: Install the Babel presets:
yarn add -D #babel/preset-env #babel/preset-react
STEP 2: Create a file: babelrc.js and add the presets:
module.exports = {
// ...
presets: ["#babel/preset-env", "#babel/preset-react"],
// ...
}
STEP 3:- Install the babel-loader:
yarn add -D babel-loader
STEP 4:- Add the loader config in your webpack.config.js:
{
//...
module: [
rules: [
test: /\.(js|mjs|jsx|ts|tsx)$/,
loader: require.resolve('babel-loader')
]
]
//...
}
Good Luck...
npm install --save-dev babel-preset-node5
npm install --save-dev babel-preset-react
...and then creating a .babelrc with the presets:
{
"presets": [
"node5",
"react"
]
}
...resolved a very similar issue for me, with babel 3.8.6, and node v5.10.1
https://www.npmjs.com/package/babel-preset-node5
https://www.npmjs.com/package/babel-preset-react
Same error, different cause:
Transpiling had worked before and then suddenly stopped working, with files simply being copied as is.
Turns out I opened the .babelrc at some point and Windows decided to append .txt to the filename. Now that .babelrc.txt wasn't recognized by babel. Removing the .txt suffix fixed that.
fix your .babelrc
{
"presets": [
"react",
"ES2015"
]
}
In year 2018:
Install following packages if you haven't yet:
npm install babel-loader babel-preset-react
webpack.config.js
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['es2015','react'] // <--- !`react` must be part of presets!
}
}
],
}
Ultimate solution
I wasted 3 days on this
import react from 'react' unexpected identifier
I tried modifying webpack.config.js and package.json files, and adding .babelrc, installing & updating packages via npm, I've visited many, many pages but nothing has worked.
What worked? Two words: npm start. That's right.
run the
npm start
command in the terminal to launch a local server
...
(mind that it might not work straight away but perhaps only after you do some work on npm because before trying this out I had deleted all the changes in those files and it worked, so after you're really done, treat it as your last resort)
I found that info on this neat page. It's in Polish but feel free to use Google translate on it.
I have this code:
"use strict";
import browserSync from "browser-sync";
import httpProxy from "http-proxy";
let proxy = httpProxy.createProxyServer({});
and I have installed babel-core and babel-cli globally via npm. The point is when I try to compile with this on my terminal:
babel proxy.js --out-file proxified.js
The output file gets copied instead of compiled (I mean, it's the same as the source file).
What am I missing here?
Babel is a transformation framework. Pre-6.x, it enabled certain transformations by default, but with the increased usage of Node versions which natively support many ES6 features, it has become much more important that things be configurable. By default, Babel 6.x does not perform any transformations. You need to tell it what transformations to run:
npm install babel-preset-env
and run
babel --presets env proxy.js --out-file proxified.js
or create a .babelrc file containing
{
"presets": [
"env"
]
}
and run it just like you were before.
env in this case is a preset which basically says to compile all standard ES* behavior to ES5. If you are using Node versions that support some ES6, you may want to consider doing
{
"presets": [
["env", { "targets": { "node": "true" } }],
]
}
to tell the preset to only process things that are not supported by your Node version. You can also include browser versions in your targets if you need browser support.
Most of these answers are obsolete. #babel/preset-env and "#babel/preset-react are what you need (as of July 2019).
I had the same problem with a different cause:
The code I was trying to load was not under the package directory, and Babel does not default to transpiling outside the package directory.
I solved it by moving the imported code, but perhaps I could have also used some inclusion statement in the Babel configuration.
First ensure you have the following node modules:
npm i -D webpack babel-core babel-preset-es2015 babel-preset-stage-2 babel-loader
Next, add this to your Webpack config file (webpack.config.js) :
// webpack.config.js
...
module : {
loaders : [
{
test : /\.js$/,
loader : 'babel',
exclude : /node_modules/,
options : {
presets : [ 'es2015', 'stage-2' ] // stage-2 if required
}
}
]
}
...
References:
https://gist.github.com/Couto/6c6164c24ae031bff935
https://github.com/babel/babel-loader/issues/214
Good Luck!
As of 2020, Jan:
STEP 1: Install the Babel presets:
yarn add -D #babel/preset-env #babel/preset-react
STEP 2: Create a file: babelrc.js and add the presets:
module.exports = {
// ...
presets: ["#babel/preset-env", "#babel/preset-react"],
// ...
}
STEP 3:- Install the babel-loader:
yarn add -D babel-loader
STEP 4:- Add the loader config in your webpack.config.js:
{
//...
module: [
rules: [
test: /\.(js|mjs|jsx|ts|tsx)$/,
loader: require.resolve('babel-loader')
]
]
//...
}
Good Luck...
npm install --save-dev babel-preset-node5
npm install --save-dev babel-preset-react
...and then creating a .babelrc with the presets:
{
"presets": [
"node5",
"react"
]
}
...resolved a very similar issue for me, with babel 3.8.6, and node v5.10.1
https://www.npmjs.com/package/babel-preset-node5
https://www.npmjs.com/package/babel-preset-react
Same error, different cause:
Transpiling had worked before and then suddenly stopped working, with files simply being copied as is.
Turns out I opened the .babelrc at some point and Windows decided to append .txt to the filename. Now that .babelrc.txt wasn't recognized by babel. Removing the .txt suffix fixed that.
fix your .babelrc
{
"presets": [
"react",
"ES2015"
]
}
In year 2018:
Install following packages if you haven't yet:
npm install babel-loader babel-preset-react
webpack.config.js
{
test: /\.jsx?$/,
exclude: /node_modules/,
use: [
{
loader: 'babel-loader',
options: {
presets: ['es2015','react'] // <--- !`react` must be part of presets!
}
}
],
}
Ultimate solution
I wasted 3 days on this
import react from 'react' unexpected identifier
I tried modifying webpack.config.js and package.json files, and adding .babelrc, installing & updating packages via npm, I've visited many, many pages but nothing has worked.
What worked? Two words: npm start. That's right.
run the
npm start
command in the terminal to launch a local server
...
(mind that it might not work straight away but perhaps only after you do some work on npm because before trying this out I had deleted all the changes in those files and it worked, so after you're really done, treat it as your last resort)
I found that info on this neat page. It's in Polish but feel free to use Google translate on it.